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<p>This study investigates the load-deformation and load-sharing behavior of combined pile-raft foundations (CPRF) using three-dimensional finite element analysis on three different types of sand: Ennor sand, Silver sand, and River sand. Triaxial (unconsolidated undrained) and density index tests were conducted to obtain the input parameters for the foundation medium in the finite element model. The results indicate that the load-bearing performance of the CPRF was significantly influenced by parameters such as raft thickness, pile length-to-diameter ratio (l/<i>d</i>), pile spacing-to-diameter ratio (<i>s</i>/<i>d</i>), and the relative density of the sand. Specifically, variations in raft thickness lead to a 22–29% increase in the maximum load-carrying capacity of CPRF across the three types of sand. Additionally, improvements in the pile l/<i>d</i> and <i>s</i>/<i>d</i> ratios variation result in load-carrying capacity increases of 26–35% and 45–48%, respectively. The findings demonstrate that the total load-carrying capacity of CPRF and the distribution of load between the raft and piles are highly dependent on the structural parameters and relative density of sand, particularly in cohesionless soils.</p>

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Load Settlement and Load Sharing Characteristics of a Combined Pile-Raft Foundation in Granular Soil Deposits: A Numerical Simulation Approach

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Kabiraj Mahata,
  • Ashis Kumar Bera

摘要

This study investigates the load-deformation and load-sharing behavior of combined pile-raft foundations (CPRF) using three-dimensional finite element analysis on three different types of sand: Ennor sand, Silver sand, and River sand. Triaxial (unconsolidated undrained) and density index tests were conducted to obtain the input parameters for the foundation medium in the finite element model. The results indicate that the load-bearing performance of the CPRF was significantly influenced by parameters such as raft thickness, pile length-to-diameter ratio (l/d), pile spacing-to-diameter ratio (s/d), and the relative density of the sand. Specifically, variations in raft thickness lead to a 22–29% increase in the maximum load-carrying capacity of CPRF across the three types of sand. Additionally, improvements in the pile l/d and s/d ratios variation result in load-carrying capacity increases of 26–35% and 45–48%, respectively. The findings demonstrate that the total load-carrying capacity of CPRF and the distribution of load between the raft and piles are highly dependent on the structural parameters and relative density of sand, particularly in cohesionless soils.